On Thu, Feb 25, 2016 at 01:28:31AM +1100, Michael Ellerman wrote:
> The main change is to just use paca->kernel_toc, rather than a branch to
> +4 and mflr etc. That makes the code simpler and should also perform
> better.
Indeed.
> There was also a sequence after ftrace_call() where we load from
> pt_regs->nip, move to LR, then a few instructions later load from LRSAVE
> and move to LR. Instead I think we want to put pt_regs->nip into CTR and
> branch to it later.
Yes, I did some of this cleanup in the livepatch implementation.
> We also rework some of the SPR loads to hopefully speed them up a bit.
> Also comment the asm much more, to hopefully make it clearer.
>
> Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
Reviewed-by: Torsten Duwe <d...@suse.de>
Torsten
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